Something to have more "grip" ?
Shouldn't be a problem...
Do you prefer grooves (like the surface of a gramophone record) or treads/steps (like a stairway) ?
Optimized for which material ? (Frosted Detail allows much finer lines than White Detail, for example.)

What's about the dimensions ?
Especially the diameter and the height...

But I would need to know at least the preferred diameter for your frisbee.
(Or, if that's easier, the preferred price... Shapeways charges per cm³ of the used material, so I can also calculate backwards.)